鹤岗地震台台基背景噪声特征分析

Analysis of Background Noise Characteristics of Hegang Seismic Station Foundation

本文选取了鹤岗地震台2008、2009年及2018、2019年相同时间段内的数字观测资料数据,对观测数据的地动噪声功率谱密度、地动噪声RMS值、观测动态范围等参数进行计算分析,通过数据对比分析,得到了鹤岗台区域的近十年背景噪声的变化特征。经过计算分析发现,2008、2009年分别对比2018、2019年的三分向噪声功率谱密度曲线一致性较差,RMS值变化较大,虽然功率谱密度PSD曲线介于NLNM和NHNM之间,但是整体观测动态范围有所下降,台站观测背景噪声增大、仪器自身老化等问题需要及时进行处理,分析结果可以作为台站的背景噪声参考数据,为以后研究台站背景噪声积累可靠的数据资料。

In this paper,the digital observation data of Hegang seismic station in 2008,2009,2018 and 2019 in the same time period are selected to calculate and analyze the power spectral density,RMS value and observation dynamic range of the observation data.Through data comparison and analysis,the change characteristics of background noise in Hegang seismic station in recent ten years are obtained.Through calculation and analysis,it is found that the consistency of power spectral density curve of the three-way noise in 2008,2009,2018 and 2019 is poor,and RMS value changes greatly.Although the PSD curve is between NLNM and NHNM,the overall observation dynamic range has declined.And the problems such as the increase of background noise and the aging of the instrument itself need to be dealt with in time.The analysis results can be used as stations.The reference data of background noise can be used to accumulate reliable data for future research.